Drawing implement.



l(No Model.)

AQ L. PATTERSON. DRAWING IM'PLEMENT.

(Application led Feb. 19, 1900.)

Patnted Apr. 17, |900.

/NV f5" ,"1/11/ l,

EWMEYS VNITED STATES PATENT OFFICE.

ARTHUR LOW PATTERSON, OF CHINA GROVE, NORTH CAROLINA.

DRAWING llVIPLEM ENT.

SPECIFICATION forming part of Letters Patent N o. 647,867, dated April17, `1900. Application filed February 19,1900. Serial NO- 5,729. (Nomodel.)

To all wiz/om it may concern:

Beit known that I, ARTHUR Low PATTER- SON, a citizen of the UnitedStates, residing at China Grove, in the county of Rowan and State ofNorth Carolina, have invented a new and Improved Drawing Implement, ofwhich the following is a full, clear, and exact description.

My invention relates to drawing implements,and has for its obj ect toprovide a simple and inexpensive means for drawing ellipses. To this endI provide the attachments fully described hereinafter,and specificallydefined in the claims. 4

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a perspective View illustrating the application of myinvention. Fig. 2 is a plan showing a ruler with my attachment appliedthereto. Figs. 3 and 4t are end views of the two clips employed inconnection With the ruler. Fig. 5 is anend elevation ot' a rulingpenprovided with my attachment, the attachment being shown in section. Fig.6 is a face view of the attachment shown in Fig. 5, and Fig. 7 is a faceview of another form of the said attachment.

In carrying out my inventionl employ two clips adapted to be secured toa ruler. One of the clips A is provided at its lower end with aprojecting portion A', having a return portion A2 above it, said returnportion being slitted, as at A3. The two portions A A2 form a clamp fora cord or string B, which is passed between the members A' A2 and outthrough the slit A3, as shown in Fig. 2, the endwise movement of thestring being prevented by tying a knot B in it. The clip A lits upon aruler C, for instance, of triangular form, as shown, and the clamp A A2projects from the edge of the said ruler. The other clip D has at oneside a portion D, projecting to the same extent as the portion A' andhaving a return-lip D2, slotted at D3. Toward the otherend of the clip Dextends a turned-up portion D4, forming a clamp, but not projecting sofar from the body of the clip as the lip D2.V On the other side of theruler the clip D is provided with a thumb-piece D5. The string B isfirst passed through the slit D3 of the lip D2 and then through thelongitudinal clamp formed by the turned-up portion D4.

The string B is adapted to form the guide for an attachment on theruling-pen E. This pen maybe of any usual type, and the attachmentconsists of a plate F of suitable formation to tit one of the members ofthe ruling-pen and provided at its bottom with a passage-way F for the string B. This passage-way is preferably formed by bending up the end ofthe attachment-plate F to form a hook F2. This attachment-plate issecured to the ruling-pen by means of a thumb-screw E and is adjustablethereon, the screw passing for this purpose either through a verticalslot F3 in the attachment-plate, as shown in Figs. 5 and 6, or throughone of a series of superposed holes F4, as shown in Fig. 7.

The manner of using the implement is clearly shown in Fig. l. The clipsA and D are set according to the scale on the ruler, each clipindicating one of the foci of the ellipse. The string is then secured tothe clips in the manner hereinbefore described and is also passedthrough the hook F2 of` the attachment-plate of the ruling-pen, and thecllipse may then be drawn in the usual inanner. It will be observed thatsince the points at which the string B is fastened-that is, the slits A3and DS-are somewhat in advance of the corresponding edge of the clips AD the ellipse or, rather, the half-ellipse can be drawn very accuratelyeven to the ends of the greatest diameter. what above the paper ordrawing surface and not in contact with it, the resistance to themovement of the implement is reduced and the danger of blurring thelines is avoided. The vertical adj ustability of the plate F is ofadvantage, since in drawing a large ellipse it will be advisable toraise the attachment-plate F to compensate for the greater amount ofsagging in the string. Furthermore, this adjustability allows the plateF to be used with ruling-pens of various sizes.

The implement is simple and compact, and even small ellipses can bereadily drawn with it, as the clips A andD have the string-clampingdevices at their adjacent ends and can be moved closely together. Theclip A isgen- As the string B is held some-V IOO erally stationary, andthe draftsman with his left hand can readily adjust the string B andclamp, aruling-pen and a plate adapted .for

attachment to the ruling-pen and provided with a passage-way forl thestring.

2. A drawing implement', comprising a string, a ruler, two clips adaptedto'be slipped on the ruler and each provided with a stringclampprojecting from the edge of the`clitp,a

ruling-pen and a plate adapted for attachment to the ruling-pen andprovided with va passagewaj7 for the string.

3. A drawing implemen-t, comprising a.'

string, a ruler, two clips adapted to be slipped on the ruler and eachprovided with a stringclamp projecting fromthe edge of the clip the samedistance'as the clamp .of the other clip, one of the clips being furtherprovided with an additional string-clamp arranged inwardly withreference to the first named clamp, a ruling-pen and a plate adapted forattachment to the ruling-pen and provided with a passage-way for thestring.

4. A drawingimplement, comprising av string, a ruler, two clips adaptedto be slipped on the ruler and each` provided with a stringclampprojecting from the edge of the clip the same distance as the clamp ofthe other clip, one of the clips being further provided with anadditional string-clamp arranged inwardly vwith reference to the firstnamed clamp, and with a projection o r thumb-piece located on the otherside of the clip, a rulingpen and a plate adapted for attachment to theruling-pen and provided with a passage- Way for the string. l

5.v A drawing implement, comprising a string, a ruler, two clips'adaptedto be slipped on the ruler and each provided with a stringholdingdevi'ce,a ruling-pen and a plate adapted for attachment to theruling-pen and provided atits lower end with a hook forming apassage-way for the string.

6.k A .drawing implement, comprising a string, a ruler, two clipsadaptedto be slipped on the ruler and each provided with'astringholdingdevice,a ruling-pen and a plate adapt- Ved for attachment to theruling-pen and provided with a passage-way for the string, said platehavin g means for adj nsting it vertically.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ARTHUR LOW PATTERSON.

1 Witnesses: l

T. D. CAsTo, G. M. DUVAL.

